Packaged sandwich and sandwich packaging method

Abstract

To provide a packed sandwich that can be automatically packed and is easy to unpack.SOLUTION: A packed sandwich has a pair of right-angled triangular surfaces opposing each other, a first rectangular surface and a second rectangular surface along each of the two sides that intersect at the right angle of the right triangles, a backing seal part along the first rectangular surface and the second rectangular surface with which the triangular prismatic sandwich with a third rectangular surface along the hypotenuse is packaged by folding a rectangular packaging sheet, a folding part formed on the first rectangular surface and the second rectangular surface, a sealing part formed along a shared side of the first rectangular surface and the third rectangular surface and a shared side of the second rectangular surface and the third rectangular surface, an unpacking aid part provided along a shared side of the first rectangular surface and the second rectangular surface, and an antifouling sheet in contact with a third rectangular side of the sandwich and the two right triangular sides.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention relates to a technique for packaging sandwiches in the shape of a right triangle with a food packaging sheet. [Background technology]

[0002] The sandwiches in the shape of a right-angled triangle are stored in a packaging bag made of plastic film and displayed in stores. The sandwich packaging used is a bag-shaped packaging made of a plastic film having an isosceles trapezoidal portion. A connection part of two plastic films is formed with a predetermined width on the hypotenuse and upper side of the isosceles trapezoidal portion, and the lower side of the isosceles trapezoidal portion is an opening where the upper and lower plastic films are not connected. The right-angled triangle sandwich is placed through the opening of this packaging bag, and the opening is folded and sealed. Patent Documents 1, 2, 3, etc. describe packaged sandwiches in which such a right-angled triangle sandwich is packaged in a packaging bag.

[0003] Patent documents 4 and 5 describe a sandwich package in which a film is wrapped around a sandwich in the thickness direction to form a cylindrical shape, and then at least one seal is applied in the longitudinal direction of the film. The film is folded along an inclined surface based on the edge where the inclined surfaces on which the short sides of the sandwich are located meet, and the lateral extensions of the film that contact each short side of the sandwich are folded along the inclined surface based on the short sides to package the sandwich.

[0004] Furthermore, Patent Document 6 describes a sandwich package comprising a triangular prism-shaped sandwich and a tubular packaging sheet having a sloping portion that follows the sloping surfaces of the sandwich and a pair of bottom portions that follow the pair of bottom surfaces, covering the periphery of the triangular prism, in which each excess portion of the tubular packaging sheet corresponding to each side connected to the sloping surfaces and both bottom surfaces of the sandwich is formed into a gusset portion folded from both sides and a side portion that is connected to both gusset portions and placed on the surface side along each side, and the extended portions of the sloping portions and the extended portions of the side portions are sealed to each other to hermetically package the sandwich. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-315064 A [Patent Document 2] JP 2013-166566 A [Patent Document 3] Japanese Patent Application Publication No. 9-24950 [Patent Document 4] Japanese Patent Application Publication No. 6-24466 [Patent Document 5] Japanese Patent Application Publication No. 7-291348 [Patent Document 6] JP 2003-291915 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the sandwich packaging materials described in Patent Documents 1 and 2, the mouth is folded and sealed, but this folding process is difficult to automate and is performed manually. In addition, in Patent Document 1, after folding, an adhesive tape or the like is applied to seal the mouth.

[0007] In the invention of Patent Document 3, the entire width of the opening is heat-sealed, and the inside of the bag is sealed with the opening as the sealing part, so it was expected that the sealing performance would be further improved. However, after a detailed study of the invention of Patent Document 3, it was found that it is difficult to realize this. First, two sets of heating devices perpendicular to each other are required, and the two sets of heating devices must be controlled, making the equipment complicated and expensive. Moreover, it is difficult to accurately apply pressure to deform the mouth of the packaging bag in a perpendicular direction from its original state.

[0008] Patent Documents 4 and 5 state that since a continuous strip of film can be used for packaging, packaging costs can be kept low and automation of sandwich packaging can be easily achieved. However, Patent Documents 4 and 5 do not include a sheet to cover the slanted surface of the sandwich. A triangular sandwich is formed by stacking multiple rectangular breads with ingredients between them and cutting them along the diagonal line, but the ingredients are exposed on the slanted surface, which is the cut surface, and if it is wrapped in the main sheet of packaging material as it is, the ingredients will stick to it, which is unpleasant and unhygienic. Patent Document 4 describes a cutting line consisting of perforations as a means for opening, and Patent Document 5 describes an opening cut, but it is troublesome to open using these opening means.

[0009] Patent Document 6 shows how the tubular packaging sheet is folded so as to be in close contact with the sandwich while the sandwich is surrounded by the tubular packaging sheet, and also describes how a filling sheet is placed on the inclined surface of the sandwich. However, when placing the sandwich, the filling sheet is placed on the inclined surface between the sandwich and the tubular packaging sheet in advance, or the sandwich is placed on the tubular packaging sheet on which the filling sheet is placed, making it difficult to automate packaging. Also, in Patent Document 6, the opening notch formed in the center seal is pinched and the side portion is torn from the center seal to open the package. However, it is difficult to properly open the side where the sheet is folded using only the opening notch.

[0010] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a packaged sandwich which can be packaged automatically and which is easy to open. [Means for solving the problem]

[0011] In order to solve the above problems, the packaged sandwich of the present invention is a triangular prism-shaped sandwich having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of the two sides intersecting at the right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, packaged in a packaging material formed by folding a rectangular packaging sheet, The packaging material is aligned along the first rectangular surface and the second rectangular surface. hand A formed back seal portion, a fold formed on the first rectangular surface and the second rectangular surface; The common side of the first rectangular face and the third rectangular face and the common side of the second rectangular face and the third rectangular face On each side A seal portion formed along the An opening aid provided along a common edge of the first and second rectangular faces line and, A stain-blocking sheet is provided adjacent the third rectangular face and the two right-angled triangular faces of the sandwich. The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a dirt prevention sheet provided inside the paper sheet, and a separation auxiliary line provided along the center line of the dirt prevention sheet. Equipped with , tear tape provided along the separation auxiliary line of Opening assistance line This is provided as a Tear Tape and Separation Aids line is provided along a common edge of the first rectangular surface and the second rectangular surface, A window may be exposed on the third rectangular surface. The width of the tear tape may be between 20mm and 30mm.

[0012] The sandwich packaging method of the present invention is a method for packaging a triangular prism-shaped sandwich having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of the two sides intersecting at the right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, A sandwich packaging roll having a continuous belt-shaped packaging sheet portion and an opening assist line continuously provided inside the packaging sheet portion is periodically cut at a constant length to form a rectangular packaging sheet, The sandwich is placed so that the common edge of the first and second rectangular surfaces overlaps the opening assist line in a plan view, and the third rectangular surface is placed in contact with the packaging sheet; The two sides perpendicular to the cutting line are sealed together to form the back section. deathA rectangular tube is formed with the sandwich inside. folding a portion of the packaging sheet over the first rectangular surface and the second rectangular surface to form a fold over each of the first rectangular surface and the second rectangular surface; The common side of the first rectangular face and the third rectangular face and the common side of the second rectangular face and the third rectangular face On each side Seal by sealing along the The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a dirt prevention sheet provided inside the paper sheet, and a separation auxiliary line provided along the center line of the dirt prevention sheet. Equipped with , tear tape provided along the separation auxiliary line of Opening assistance line Use what is provided as The tear tape and separation assist line may be wrapped along a common edge of the first rectangular surface and the second rectangular surface. The packaging sheet includes a pair of paper sheets spaced apart from each other, a transparent film attached by easy-to-peel adhesion to the outer surface of the paper sheets between the pair of paper sheets, and a stain-preventing sheet attached to the inner surface of the transparent film, Transparent film of The first and second rectangular faces may be wrapped together along a common edge.

[0013] Furthermore, the sandwich packaging base material of the present invention comprises a pair of paper sheets spaced apart from each other and continuously arranged, a transparent film arranged between the pair of paper sheets, a pair of stain-preventive sheets spaced apart from each other and arranged on the inner surface of the transparent film, and a tear tape arranged between the pair of stain-preventive sheets. Also, another sandwich packaging base material comprises a pair of paper sheets spaced apart from each other, a transparent film between the pair of paper sheets, a first surface of which is attached to the paper sheets by easily peelable adhesion, and a stain-preventive sheet arranged on the first surface of the transparent film. Effect of the Invention

[0014] The packaging sandwich of the present invention allows for automated packaging. An opening aid is provided along a common edge of the first and second rectangular faces. line When opening the sandwich, it can be cut open along the center, allowing the sandwich inside to be easily removed. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view showing a wrapped sandwich. [Diagram 2] FIG. 2 is a perspective view showing the outer shape of the sandwich as seen from the oblique side. [Diagram 3] FIG. 2 is a perspective view showing the outer shape of the sandwich as seen from a vertical surface side. [Figure 4] FIG. 2 is a plan view showing a first example of a packaging sheet. [Diagram 5] FIG. 1 is a plan view showing a first example of a sandwich packaging roll. [Figure 6] FIG. 2 is a perspective view showing a state in which the packaging sheet is formed into a cylindrical shape. [Figure 7] 1 is a perspective view showing a state in which the packaging sheet is in contact with a first rectangular surface. [Figure 8] 1 is a perspective view showing a state in which one of the ears is folded onto a first rectangular surface. [Figure 9] 1 is a perspective view showing a state in which both ears are folded onto a first rectangular surface. [Figure 10] 1 is a perspective view showing a state in which the protruding portion of the sheet has been heat-sealed. [Figure 11] FIG. 11 is a plan view showing a second example of the packaging sheet. [Figure 12] FIG. [Figure 13] FIG. [Figure 14] FIG. 2 is a plan view showing a second example of a sandwich packaging roll. [Figure 15] FIG. 11 is a perspective view showing the wrapped sandwich of the second example, seen from the oblique side. [Figure 16] FIG. 11 is a plan view showing a third example of the packaging sheet. [Figure 17] FIG. [Figure 18] FIG. 11 is a plan view showing a third example of a sandwich packaging roll. [Figure 19] FIG. 13 is a perspective view showing a third example wrapped sandwich. [Figure 20] FIG. 11 is a plan view showing a fourth example of the packaging sheet. [Figure 21] FIG. [Figure 22] FIG. 11 is a plan view showing a fourth example of a sandwich packaging roll. [Diagram 23] FIG. 11 is a perspective view showing a fourth example wrapped sandwich. [Figure 24] FIG. 11 is a plan view showing a fifth example of a packaging sheet. [Diagram 25] FIG. [Figure 26] FIG. 11 is a plan view showing a fifth example of a sandwich packaging roll. [Figure 27] FIG. 10 is a perspective view showing a wrapped sandwich of the fifth example.

[0016] The embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a perspective view showing a packaged sandwich, Fig. 2 is a perspective view showing the outer shape of the sandwich as seen from an oblique side, and Fig. 3 is a perspective view showing the same as seen from a vertical side.

[0017] The sandwich to be packaged will be described. The sandwich 30 to which the present invention is applied is a triangular sandwich as shown in Figs. 2 and 3. It is a triangular prism having a pair of opposing right-angled triangular faces 34, a first rectangular face 31 and a second rectangular face 32 along the two sides that intersect at the right angle of the right triangle, and a third rectangular face 33 along the hypotenuse of the right triangle. In other words, the third rectangular face 33 is the inclined face of the sandwich, and the first rectangular face 31 and the second rectangular face 32 are vertical faces. Here, the two sides that intersect at the right angle may be an isosceles right triangle (L=H) in which the lengths are the same, or may be different (L≠H). In the case of an unequal side, the direction of the short side L is the length, and the direction of the long side H is the height. In this example, H is slightly longer than L, and the length L is 97 mm, the height H is 102 mm, and the width W is 65 mm.

[0018] A sandwich is made by stacking several rectangular pieces of bread, usually two or three, with ingredients sandwiched between them. By cutting this along the diagonal, a triangular prism-shaped sandwich is obtained. Therefore, the ingredients are exposed on the third rectangular surface 33, which is the cut surface. Usually, two or three sandwiches are stacked and packaged in one packaging sheet. Figures 2 and 3 show the external appearance of the stacked sandwiches.

[0019] The packaging sheet will be described. FIG. 4 is a plan view showing a first example of the packaging sheet. The shape and structure of the packaging sheet are set based on the outer shape of the sandwich to be packaged. The packaging sheet 10 is rectangular, and the surface that contacts the sandwich during packaging is shown as the upper surface in FIG. 4. The region R3 that should contact the third rectangular surface 33 of the sandwich is shown as a vertically long rectangle in the center in FIG. 1. On both sides of the region R3, there are regions R4 that contact the triangular surface 34 of the sandwich, and on the outside of that, there are regions R1 that should contact the first rectangular surface 31 and R2 that should contact the second rectangular surface 32. Further outside, a back-sealed region R5 is shown along the end. The remaining portion is the region that is folded over during packaging. In this example, an unsealed region is left between the end edge and the back-sealed region R5.

[0020] The opening assist line 12 is provided along a line connecting the right angles of the region R4 where the two triangular faces meet. When the triangular face 34 is an isosceles triangle, it is along the center line of the width of the packaging sheet 10, but when the triangular face 34 is scalene, it is at a position shifted from the center line. The opening assist line 12 may be any line that is effective for separating the packaging sheet 10 along the line, and may be, for example, a perforation or a half cut. In this example, a tear tape called a cut tape is attached to the surface that comes into contact with the sandwich when packaging, that is, the surface that appears on the front side in FIG. 4. In addition, a cut is provided in the sheet body at both ends of the tear tape to generate a tab at the end of the tear tape, which serves as the starting point for opening when opening.

[0021] The main body sheet 11 can be made of a wide variety of materials suitable for packaging, such as transparent film or paper. In the example of Fig. 1, it is made of a single sheet material, but it may be made of a combination of multiple materials, such as a paper sheet and a transparent film, as in the example described below. When using a paper sheet, a polylaminate or dry coat is provided on the surface that comes into contact with the sandwich to form a heat-sealable layer.

[0022] FIG. 5 is a plan view showing a first example of a raw material for sandwich packaging. The raw material for sandwich packaging is a continuous sheet of packaging sheets 1 as shown in FIG. 4. The raw material has a continuous belt-like body sheet and opening assist lines provided continuously in the body sheet along the length of the body sheet. In this example, opening tapes are continuously attached to the body sheet. The raw material is cut from the leading end at intervals based on the length of one packaging sheet, thereby producing packaging sheets one by one. The raw material for sandwich packaging is provided to the person who will package the sandwiches in a wound state on a bobbin.

[0023] A method of packaging a sandwich will be described. A sandwich packaging roll of the length of one packaging sheet is pulled out from a bobbin on which the sandwich packaging roll is wound and cut. This forms one packaging sheet. Then, the third rectangular surface 33 of the sandwich x is placed facing downward in an area R3 that contacts the third rectangular surface at the center of the packaging sheet 1. At this time, the first rectangular surface 31 and the second rectangular surface 32 face upward. The common side of the first rectangular surface 31 and the second rectangular surface 32 is aligned with the position of the opening assist line 12 in a plan view.

[0024] Next, both ends of the packaging sheet 1 (Fig. 4 The left and right edges of the packaging sheet 1 are lifted up and wrapped around the sandwich 30, and the back seal areas R5 at both ends are joined together and heat sealed on the upper side. This forms the back seal portion 2, and the packaging sheet 1 becomes a rectangular tube with the sandwich 30 inside (see FIG. 6 At this time, the triangular surface contact area R4 of the packaging sheet 1 is in contact with the triangular surface 34 of the sandwich x.

[0025] There is a space between the top surface of the cylindrical packaging sheet 1 and the first and second rectangular surfaces 31 and 32. One of the rectangular surfaces, for example the packaging sheet on the first rectangular surface 31, is folded so as to press it against the first rectangular surface 31. The contact area R1 of the packaging sheet 1 with the first rectangular surface is in contact with the first rectangular surface 31. At this time, the sheet portion outside the contact area R1 is folded to form ears on both sides of the first rectangular surface 31 (FIG. 7). One of the ears is folded along the side of the first rectangular surface 31 and folded onto the first rectangular surface 31 (FIG. 8). The other ear is also folded in the same way (FIG. 9). The packaging sheet on the other rectangular surface, here the second rectangular surface 32, is also folded in the same way. In this way, all the surfaces of the sandwich x are wrapped by the packaging sheet 1.

[0026] A part of the sheet remains as a protruding portion on the outer side of each of the first rectangular surface 31 and the second rectangular surface 32. The protruding portions are heat sealed along the respective sides of the first rectangular surface 31 and the second rectangular surface 32 to form a seal portion (FIG. 10).

[0027] The remaining sheet portions may be folded over one or both of the rectangular faces. In this example, only the protrusion on the second rectangular face 32, which forms the bottom face, is folded over. The protrusion on the first rectangular face 31 is left unfolded. A wrapped sandwich is thus obtained, wrapped in wrapping material (Figure 1). This process can be largely automated. The step of placing the sandwich on a wrapping sheet cut from the roll can be done manually or can also be automated. The wrapped sandwich is fed out and the next wrapping sheet is pulled from the sandwich wrapping roll, and the same process is repeated in sequence.

[0028] In the packaged sandwich, the opening assist line goes all the way around the sandwich along approximately the center of the sandwich, starting from the back seal, running along the common side of the first rectangular face 31 and the second rectangular face 32, extending perpendicularly from the apex (right angle) of the succeeding triangular face to the base of the triangular face, crossing perpendicularly the inclined third rectangular face 33, continuing from the base to the apex of the other triangular face, and then continuing along the common side of the first rectangular face 31 and the second rectangular face 32 to the back seal.

[0029] We will now explain how to open a sandwich package. The main sheet can be torn apart by the opening assistance line. In this example, a tear tape is used, and since its end is located at the back seal, the main sheet can be torn apart by pinching the end and pulling the tear tape. By pulling all of the tear tape, the main sheet is divided into two. Then, by pulling either side of the two pieces, it can be removed from the sandwich, exposing almost half of the sandwich. This allows the sandwich inside to be easily taken out and eaten.

[0030] A second embodiment of the present invention will be described. Fig. 11 is a plan view showing a second example of the packaging sheet, Fig. 12 is a cross-sectional view taken along line AA of the same, and Fig. 13 is a cross-sectional view taken along line BB of the same. The packaging sheet of this example also packages the sandwich shown in Figs. 2 and 3. Detailed descriptions of matters common to the first example will be omitted, and the description will focus on matters unique to this example.

[0031] The external shape of the packaging sheet 10 is the same as that of the first example when viewed from above. In this example, the main body sheet 11 is based on a paper sheet 13. The surface of the paper sheet 13 that contacts the sandwich, that is, the surface that appears on the front side in FIG. 11, is heat-sealable. In this example, a polylaminate is provided. Meanwhile, the opposite surface is overcoated to improve water resistance and oil resistance. Note that paper sheets are also used in the third to fifth examples described below, but in these examples too, a polylaminate and overcoat are similarly provided.

[0032] A window 14 is provided inside the paper sheet 13. In this example, the window 14 is formed by cutting out a rectangle in the paper sheet 13 inside the region R3 where the third rectangular surface 33 of the sandwich contacts. A transparent film 15 made of plastic, cellophane or the like is attached to the window 14. The transparent film 15 is slightly larger than the window 14, and its edge is joined to the window 14. In this example, the transparent film 15 is joined to the inner surface of the paper sheet 13, i.e., the surface that faces the sandwich when wrapped.

[0033] A tear tape 16 is provided as an opening assist line on the inside of the paper sheet 13 and the transparent film 15, on the front side in Fig. 11. The tear tape 16 is provided at a position that coincides with the common side of the first rectangular surface and the second rectangular surface in a plan view when the third rectangular surface 33 of the sandwich is placed in the region R3.

[0034] A stain-prevention sheet 17 is provided further inward of the paper sheet 13, the transparent film 15, and the tear tape 16, on the front side in FIG. 11. The stain-prevention sheet 17 protects the third rectangular surface 33 (slope), which is the cut surface of the sandwich, and prevents the ingredients exposed on the slope from getting dirty, and prevents the ingredients from sticking to other parts of the packaging sheet or to the hands when opening the packaging sheet. In this example, the stain-prevention sheet 17 is made of a transparent plastic film. The stain-prevention sheet 17 has a size that covers the area where more ingredients are exposed. Although the stain-prevention sheet 17 may be provided only in the area R3 that contacts the third rectangular surface 33, in this example, the stain-prevention sheet 17 is provided along the entire length of the packaging sheet (horizontal direction in FIG. 11). This allows a continuous sheet to be used in the original roll, making it easier to create the original roll.

[0035] Furthermore, the stain-prevention sheet 17 is provided with a separation auxiliary line along its length that divides it into two parts. In this example, the stain-prevention sheet 17 is divided into two parts spaced apart from each other. A tear tape 16 is disposed between the pair of stain-prevention sheets.

[0036] Fig. 14 is a plan view showing a second example of a raw material for sandwich packaging, and shows the raw material for the packaging sheet of this example. A belt-shaped paper sheet 13, a pair of stain-prevention sheets 17 provided on the inner surface of the paper sheet 13, and a tear tape 16 provided between the pair of stain-prevention sheets 17 are continuously provided. In addition, rectangular cutout holes that become window portions 14 and transparent films 15 that cover the window portions are repeatedly provided at regular intervals in the paper sheet 13, and this interval corresponds to the length of one packaging sheet. The packaging sheet 10 shown in Fig. 11 is formed by drawing out this raw material sheet 20 by the length of one packaging sheet and cutting it.

[0037] The wrapping sheet of this example can be used in the same wrapping method as the wrapping sheet of the first example. Figure 15 is a perspective view of a wrapped sandwich 1 wrapped with the wrapping sheet 10 of this example, seen from the third rectangular surface side. In this example, a paper sheet 13 is used, so most of the sandwich 30 inside is not visible. However, a window portion 14 of the wrapping sheet 10 is arranged on the third rectangular surface 33, and this surface can be observed from the outside. Since the surface showing the sandwich ingredients is visible, the sandwich can be made to look attractive. Also, consumers can select and purchase a sandwich after seeing the ingredients.

[0038] The package is opened by pulling the tear tape 16. The packaging sheet 10, including the transparent film 15 of the window 14, is divided into two parts, so one of them can be removed. Inside the packaging sandwich 1, there is a dirt-proof sheet 17 that covers the third rectangular surface 33, but since the dirt-proof sheet 17 has already been divided along the tear tape 16, it can also be easily removed.

[0039] As described above, the packaging material is provided with a stain-prevention sheet 17, so that the exposed surface of the ingredients can be kept clean. Nevertheless, packaging can be done automatically using a packaging device, and opening is easy. In this example, the packaging sheet is mainly made of paper, and the amount of plastic used is small. Therefore, it is easy to dispose of after use, and even if it leaks outside, the impact on the environment is small.

[0040] A third embodiment of the present invention will now be described. Fig. 16 is a plan view showing a third example of the packaging sheet, and Fig. 17 is a CC sectional view of the same. In this example, a paper sheet 13 is used for the main body sheet 11, and a window portion for observing the sandwich 30 is also provided. In this example, the main body sheet 11 has a pair of paper sheets 13 spaced apart from each other, and a transparent film 15 provided between the pair of paper sheets 13. A window portion is formed by the space separating the paper sheets, and this window portion is covered by the transparent film 15 provided between the paper sheets 13.

[0041] A tear tape 16 is provided as an opening assist line on the inside of the transparent film 15. Also, similar to the second example, a pair of stain prevention sheets 17 are provided with a space between them.

[0042] Fig. 18 is a plan view showing a third example of a raw roll for sandwich packaging, showing the raw roll for the packaging sheet of this example. It comprises a pair of paper sheets 13 spaced apart from each other and continuously provided, a transparent film 15 provided between the pair of paper sheets 13, a pair of stain-prevention sheets 17 spaced apart from each other and provided on the inner surface of the transparent film 15, and a tear tape 16 provided between the pair of stain-prevention sheets 17. All the members are continuous bodies extending uniformly in the length direction of the raw roll 20, which makes it easy to manufacture and wind up. The packaging sheet 10 shown in Fig. 16 is formed by drawing out the raw roll 20 by the length of one packaging sheet and cutting it.

[0043] The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Fig. 19 is a perspective view showing a sandwich packaged with the packaging sheet of this example. In this example, the window and the transparent film appear on the triangular surface 34 in addition to the third rectangular surface 33.

[0044] The package is opened by pulling the tear tape 16. The tear tape is attached to a transparent film, so it can be opened more easily than paper. In this example, the stain prevention sheet 17 is already divided along the tear tape 16, so it can be easily removed.

[0045] A fourth embodiment of the present invention will now be described. Fig. 20 is a plan view showing a fourth example of a packaging sheet, and Fig. 21 is a DD cross-sectional view of the same. In this example, like the third example, the main body sheet 11 has a pair of paper sheets 13 spaced apart from each other, and a transparent film 15 provided between the pair of paper sheets 13. A window is formed by the space separating the paper sheets, and this is covered by the transparent film 15 provided between the paper sheets.

[0046] Similar to the second and third examples To A pair of stain-prevention sheets 17 are provided at a distance from each other. Between the pair of stain-prevention sheets 17, a tear tape 16 is provided on the inside of the transparent film 15 as an opening assist line. Here, the tear tape 16 is wide, being 20 mm or more and 30 mm or less. Here, the width is 25 mm. In addition, a cut 18 is provided in the transparent film and the tear tape 16 midway through the tear tape 16, forming a tab portion 19. This cut 18 is provided at a position close to the right angle portion in region R4 where the triangular surface portion 34 contacts.

[0047] Figure 22 shows the first part of the sandwich packaging roll. 420 is a plan view showing an example of the example of the packaging sheet, showing the original roll for the packaging sheet of this example. The original roll 20 includes a pair of paper sheets 13 spaced apart from each other and continuously provided, a transparent film 15 provided between the pair of paper sheets 13, a pair of dirt prevention sheets 17 spaced apart from each other and provided on the inner surface of the transparent film 15, and a tear tape 16 provided between the pair of dirt prevention sheets 17. The tear tape has a width of 20 mm to 30 mm. The sheet height is higher at the location where the tear tape 16 is provided than in other areas, so when the original roll is wound around the paper tube, the area where the tear tape is wound rises up in particular, making it difficult to wind it up neatly. However, since a wide tear tape 16 is used in this example, the part that rises up when wound up is also wide, and the shape of the protrusion is gentle. This makes it easier to wind up and the shape of the original roll is stable. The original roll 20 is pulled out by the length of one packaging sheet and cut to form the packaging sheet 10 shown in FIG. 20.

[0048] The packaging sheet of this example can be used in the same packaging method as the packaging sheet of Example 1. Fig. 23 is a perspective view showing a sandwich packaged with the packaging sheet of this example. In this example, the window and the transparent film appear on the triangular surface 34 in addition to the third rectangular surface 33.

[0049] In the sandwich packaging, the tear tape 16 goes around the sandwich along the approximate center of the sandwich. It starts from the back seal portion 2, runs along the common side of the first rectangular surface 31 and the second rectangular surface 32, extends vertically from the apex (right angle) of the following triangular surface 34 toward the base of the triangular surface, crosses the third rectangular surface 33, which is a slanted surface, continues from the base of the other triangular surface to the apex, and continues to the back seal portion 2 along the common side of the first rectangular surface 31 and the second rectangular surface 32. The sandwich packaging 1 of this example has a grip portion 19 on the triangular surface 34. This position makes the grip portion 19 easy to grip with fingers. By gripping the grip portion 19 and pulling the tear tape 16, the transparent film 15 can be cut and the sheet body can be divided.

[0050] In the second to fourth examples, a pair of stain-prevention sheets 17 are used, and the dividing portion functions as the separation auxiliary line. However, if it is easily divisible, the separation auxiliary line of another stain-prevention sheet may be applied. For example, the stain-prevention sheet may be made into a single sheet, and a perforation or half cut may be provided to serve as the separation auxiliary line. Alternatively, even when a pair of divided stain-prevention sheets is used, both side ends may overlap each other without providing a gap, and the overlapping portion may be non-adhesive or weakly adhered so that it can be pulled apart with a weak force.

[0051] A fifth embodiment of the present invention will now be described. Fig. 24 is a plan view showing the fifth example of the packaging sheet, and Fig. 25 is an E-E cross-sectional view of the same. In this example, as in the third example, a paper sheet is used for the main body sheet 11, and a window portion for observing the sandwich is also provided. The main body sheet 11 has a pair of paper sheets spaced apart from each other, and a transparent film provided between the pair of paper sheets. A window portion is formed by the space separating the paper sheets, and this is covered by the transparent film provided between the paper sheets.

[0052] In this example, the transparent film 15 is not divided, but is a single belt-like sheet, and both sides of the transparent film 15 are bonded to the inside of the paper sheet 13 by easily peelable adhesive. Here, "easily peelable" means that the film has the necessary bonding strength without peeling until it is attempted to open the package, but can be easily peeled off without a strong force when it is attempted to peel it off. For example, the surface of the paper sheet 13 at the joint may be smoothed by coating or the like, and a low-adhesion adhesive may be used. The transparent film 15 is provided on the outer surface of the paper sheet 13, that is, the surface facing away from the sandwich when packaged, and is provided on the surface at the back in FIG. 24. In this example, the transparent film 15 is peeled off from the paper sheet 13 when the package is opened, and the transparent film 16 also serves as an opening assist line for the packaging sheet.

[0053] Fig. 26 is a plan view showing a fifth example of a raw material for sandwich packaging, and shows the raw material for the packaging sheet of this example. It comprises a pair of paper sheets arranged continuously with a gap between them, a transparent film 15 bonded to the outer surface of the paper sheets between the pair of paper sheets by easily peelable adhesive, and a stain prevention sheet 17 arranged on the inner surface of the transparent film. The raw material sheet is pulled out to the length of one packaging sheet and cut to form the packaging sheet 10 shown in Fig. 24.

[0054] The packaging sheet of this example can be used in the same packaging method as the packaging sheet of the first example. Fig. 27 is a perspective view showing a packaging sandwich of the fifth example. In this example, the window and the transparent film appear on the triangular surface 34 in addition to the third rectangular surface 33.

[0055] The package is opened by peeling the transparent film 15 off the paper sheet 13. The film is easily peeled off. The transparent film 15 is a plastic film and can be separated from the paper sheet 13, so it can be collected as plastic waste. Meanwhile, the paper sheet 13 can be collected as burnable waste that does not contain plastic. [Explanation of symbols]

[0056] 1. Wrapped sandwiches 2. Back seal 3.Sealing section 10. Packaging Sheet 11. Main sheet 12. Opening aid line 13.Paper Sheets 14. Window section 15.Transparency film 16. Tear Tape 17. Stain prevention sheet 18. Cutting 19. Knob 20. Sandwich packaging rolls 30. Sandwich 31.First rectangular plane (vertical plane) 32.Second rectangular plane (vertical plane) 33. The 3rd rectangular surface (inclined surface) 34. Triangular surface

Claims

1. A packaged sandwich, the sandwich being a triangular prism having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of two sides intersecting at a right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, packaged in a packaging material formed by folding a rectangular packaging sheet, The packaging material includes a back seal portion formed along the first rectangular surface and the second rectangular surface; a fold formed on the first rectangular surface and the second rectangular surface; a seal portion formed along each of a common edge of the first rectangular surface and the third rectangular surface and a common edge of the second rectangular surface and the third rectangular surface; An opening assist line provided along a common edge of the first rectangular surface and the second rectangular surface; The wrapped sandwich has a stain-blocking sheet bordering the third rectangular face and the two right-angled triangular faces of the sandwich.

2. The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a stain-prevention sheet provided inside the paper sheet, a separation assisting line provided along the length of the stain-prevention sheet, and an opening tape provided along the separation assisting line as an opening assisting line, A tear tape and a separation assist line are provided along a common edge of the first rectangular surface and the second rectangular surface, 2. The packaged sandwich of claim 1, wherein the third rectangular face defines a window.

3. 3. The packaging sandwich according to claim 2, wherein the width of the tear tape is 20 mm or more and 30 mm or less, and the tear initiation portion of the tear tape is formed on either of the two right-angled triangular faces.

4. A method for packaging a sandwich having a triangular prism shape having a pair of opposing right-angled triangular faces, a first rectangular face and a second rectangular face along each of two sides intersecting at the right angle of the right-angled triangle, and a third rectangular face along the hypotenuse of the right-angled triangle, A sandwich packaging roll having a continuous belt-shaped packaging sheet portion and an opening assist line continuously provided inside the packaging sheet portion is periodically cut at a constant length to form a rectangular packaging sheet, The third rectangular surface is placed in contact with the packaging sheet so that the common side of the first rectangular surface and the second rectangular surface of the sandwich coincides with the position of the opening assist line in a plan view; The two sides perpendicular to the cutting line are sealed together to form a back portion, forming a rectangular tube having the sandwich inside; folding a portion of the packaging sheet over the first rectangular surface and the second rectangular surface to form a fold on each of the first rectangular surface and the second rectangular surface; A method of sandwich packaging by sealing along a common edge of the first rectangular surface and the third rectangular surface and along a common edge of the second rectangular surface and the third rectangular surface, respectively.

5. The packaging sheet includes a paper sheet, a window provided in the paper sheet, a transparent film covering the window, a stain-prevention sheet provided inside the paper sheet, a separation assisting line provided along the length of the stain-prevention sheet, and an opening tape provided along the separation assisting line as an opening assisting line, 5. The method for packaging a sandwich according to claim 4, wherein the opening tape and the separation assist line are aligned along a common side of the first rectangular surface and the second rectangular surface.

6. 6. The packaged sandwich according to claim 5, wherein the width of the tear tape is 20 mm or more and 30 mm or less, and the tear initiation portion of the tear tape is aligned on either of the two right-angled triangular faces.

7. The packaging sheet comprises a pair of paper sheets spaced apart from each other, a transparent film provided between the pair of paper sheets by easily peelable adhesion on the outer surface of the paper sheets, and a stain-preventing sheet provided on the inner surface of the transparent film, 5. The method for packaging a sandwich according to claim 4, wherein the transparent film is wrapped along a common edge of the first rectangular surface and the second rectangular surface as an opening assist line.

Images